[quote=wolfdog1226In regards to what Texas_Ace is saying about this is typical of Sony cells:
I just checked my VTC5 that has been idle for 5 days and the voltage is 4.16v. This cell will be 2 years old in May! My experience has been different w/ my other VTC4/5 Cells.
As long as they do not keep declining, I will not be concerned. However, every other battery[much older than this]
that starts to degrade, the resting voltage gets lower and lower as time goes by!
To cap this off. I have 6 X Orbtronic 18650 3400mAh that I purchased on 12.21.2012!! They have had over 400 cycles and their resting voltage is 4.14v to 4.16V AFTER 2 OR 3 days!
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So after 5 days it is at 4.16v?
Sounds perfectly fine to me. Mine do the same thing, like I said before they will drop from 4.2v down to somewhere around 4.12-4.16V and then they will maintain that for extended periods.
What do your cells look like after a few months?
Naturally they will drop some voltages over time by .01V a month is nothing to worry about. High drain cells tend to have higher self discharge rates from my experience.
Don’t worry about a voltage drop over the first few days, worry about it over the course of weeks/months.
If the voltage is down to 4V in say 1 month, then yeah, you have an issue. At the rate the voltage was dropping in the first few days the cells should be empty in a few weeks but I am going to go out on a limb and say that doesn’t happen.